Valve.



N0. 782, 730. PATENTED FEB. 14, 1905. J. J. DUNWOODY.

VALVE.

APPLIOATIOH FILED APB. 9.1904.

WITNESSES: INVENTOR 4 0 0/571 Jana/00625 JATTORIVEYS Patented February14, 1905.

PATENT OFFICE.

JOHN J. DUNVVOODY, OF NElV YORK, N. Y.

VALVE.

SPECIFICATION forming part of Letters Patent No. 782,730, dated February14, 1905.

Application filed April 9, 1904. Serial No. 202,303.

To all whom it may concern.-

Be it known that 1, JOHN J. DUNWOODY, a citizen of the United States,and a resident of the city of New York, borough of Manhattan, in thecounty and State of New York, have invented a new and Improved Valve, ofwhich the following is a full, clear, and exact description.

This invention relates to valves, and more especially to valvesdesigned, primarily, for use on steam-pipes, but adapted for use inconduits for any fluid which does not have corrosive action upon thecylinders of the valve.

The object of the invention is to provide a valve of the characterspecified which is so constructed that the gland or stuffing-boxordinarily employed around the valve-stem to prevent the escape of steamor other fluid between the valve-stem and the casing may be dispensedwith without allowing any escape of steam around the stem.

With the object above stated and others of minor character in view, aswill hereinafter appear, the invention consists in the construction,combination, and arrangement of parts of a valve, as hereinafterdescribed in a preferred form of embodiment and having the novelfeatures thereof specifically pointed out in the appended claims, itbeing understood that changes in the form, proportions, and exact modeof assemblage of theelements of the structure may be made withoutdeparting from the spirit of the invention or sacrificing itsadvantages.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in both views.

Figure 1 is a sectional view through a valve constructed in accord withthe present invention, showing the valve seated to prevent the passageof fluid through the valve; and Fig. 2 is a sectional view through thevalve, showing the valve unseated to permit the passage of fluid throughthe valve.

Referring to the drawings, 1 designates a T, having a partition 2therein which extends in a generally oblique direction across thechannel through the T and presents a bore 3 opposite the side branch ofthe T. The bore 3 is surrounded by a rim 4, which forms a valveseat, aswill hereinafter appear, and the axis of the bore coincides withthe-axis of the side branch 5 of the T. The valve-casing 6 is connectedwith the side branch 5 of the T by a cupshaped union 7, which isinternally threaded to receive the valve-casing and is externallythreaded to engage an internal thread formed within the branch 5. Thevalve-easing is formed with two communicating chambers 8 and 9, thelatter being the larger and being nearer the base of the casing. Thesechambers are preferably formed about the same axis, and when the casingis in position the axis thereof coincides with the axis of the bore 3 inthe partition 2. In the top of the valve-casing a valve-stem 10 isrotatably mounted, which is provided with a hand-wheel 11 or the like tofacilitate the turning thereof. In the top of the chamber 8 of thevalve-casing a flange 12 upon the valve-stem fits loosely against thetop of the chamber and against the inner surface of its wall. The lowerportion of the stem is threaded to engage with a threaded socket 15 in ablock 13, which is slidably mounted within the val vecasing and has atits lower end a flange 14, which [its within the larger chamber 9'of thecasing, while the upper portion of the block fits smoothlywithin thechamber 8 of the easing. At its lower end the block 13 is provided witha threaded socket 16 for the reception of a threaded stud upon the uppersurface of the valve, and the block is held against rotative movementwithin the chambers of the valve-casing by means of a feather 17, formedat one side of the chamber 8 and engaging with a corresponding groove inthe block 13.

The valve proper consists of a member 18, provided on its upper surfacewith an externally-threaded stud which engageswith the threaded socket16 in the lower end of the block 13. The member 18 has a flange 19recessed on its under surface to receive an annular packing-washer 20,of any suitable material, which surrounds a downwardly-disposed stud 21upon the under surface of the valve member and is secured in position bymeans of a nut 22 upon the said stud.

The operation of the valve above described will be readily understoodfrom an inspection of the drawings, in which the members of the valvestructure are shown in open and closed position. Assuming that the valveisclosed, as shown in Fig. 1, the rotation of the handwheel 11 inclockwise direction will cause the block 13 to be drawn upward in thechambers 8 and 9 of the valve-casing, and the valve member 18 will beraised therewith. W'hen the valve is open, as shown in Fig. 2, thereverse rotation of the hand-wheel 11 will cause the block 13 to descendin the casing, and the packing-washer carried by the valve member willcontact with the rim 4:, which forms the valve-seat surrounding the bore3. The arrangement of the block 13 within the cham.

bers 8 and 9 of the valve-casing makes the provision of a stuffing-boxor gland about the Valve-stem unnecessary to prevent the escape of steambetween the valve-stem and the valvecasing. As will be seen from aninspection of the drawings, the steam or other fiuid in escaping at thetop of the valve-casing must first pass between the upper surface of theflange 19 of the valve member 18 and the base of the cup-shaped union 7and. then between the stud upon the top of the valve member 18 and thewall of the opening in the union 7, through which the stud extendsupward. After passing above the union 7 the steam must pass between themember 13 and the wall of the chamber 9. Then its upward passage must becontinued between the reduced portion of the member 13 and the wall ofthe chamber 8 until it finally reaches the open space in the top of thechamber 8 and can pass easily outward through the bore at the top of thevalve-casing. course which must be pursued by the steam in effecting itsescape at the top of the valvecasing is extremely tortuous, and with thevalve member 18 and sliding member 13 fitted accurately in the guideswithin which they move the opportunity afi'orded for the escape of steamis extremely limited, and with even a very slight lubrication of theparts the escape of steam will be completely prevented. l/V hen thevalve is open to its full extent, as shown in Fig. 2, the top of thefiange 19 of the valve member 18 contacts with the under surface of thecup-shaped connection 7, and the upper surface of the enlargement at thebottom of the member 13 contacts with the top of the chamber 9 in thevalve-casing, so increasing greatly the difficulty with which steamescapes through the valve casing.

Thus it will be seen that the When the valve is not open to its fullextent, the flange of the member 18 does not contact with the union 7 atthe bottom nor does the member 13 jam against the top ofthe chamber 9;but the close fit of the stud on the top of the member 18 Within theopening in the connection 7 and the close fit of the member 13 withinthe chambers 8 and 9 make the passage of steam up into the top of thevalve-casing practically impossible.

WVhile I have described the parts of the valve as arranged in theposition shown in the drawings, with the stem 10 standing vertically andhaving the hand-wheel 11 at the top thereof, it is obvious that, theposition of the valve may be varied, and reference to the upper andlower parts of the structure are made simply for convenience, and I wishit to be understood that the valve is intended to be arranged in anyposition that may be found expedient.

Having thus described my invention, Iclaim as new and desire to secureby Letters Patent 1. In a structure of the character specified, thecombination with a valve-casing having a large chamber at the lower endand a smaller chamber above the large chamber and coaxial therewith, ofa block having portions corresponding to the cross-sectional areas ofsaid chambers and arranged for sliding movement in said casing,mechanism in the upper part of said casing for imparting slidingmovement to said block, a chambered member having a valve-seat coaxialwith said casing, a union disposed between said valve-seat and saidchambered member and presenting a wall separating the chambered memberfrom the valvecasing, said wall having a central opening therein, and avalve member disposed beneath the said union and having a stemprojecting through the opening in the union and engaging said block.

2. In a structure of the character specified, the combination of avalve-casing having a plurality of communicating chambers of differentdiameters, a block fitted within said chambers for slidable movementtherein, a valve member carried by said block, and means for impartingmovement to the block.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

JOHN J. DUNWOODY.

Witnesses:

EDWARD LARKIN, MICHAEL DAVIS.

